Fig. 1: Outline of the experimental setup and procedure.
From: Precursor-free synthesis of carbon quantum dots and carbon microparticles in supercritical acetone
a, b Supercritical fluid chamber. Acetone was confined in the chamber. The temperature was regulated by a heater surrounding the chamber and a PID controller. c Time variation of the temperature. Once the temperature had reached a target value, it was kept constant for 0, 0.5, 1, 1.5, 2, or 6 h and then lowered down to room temperature. d Replacement of acetone with ethanol in the chamber. e, f Filtration of the solution with a 100 nm mesh. Sub-micro/microscale materials (“Sub-micro/microscale materials I”) were separated from the solution (“Filtered solution I”). g Dispersion of “Sub-micro/microscale materials I” in ethanol. h Filtration of the solution with a 100 nm mesh. Sub-micro/microscale materials (“Sub-micro/microscale materials II”) were separated from the solution (“Filtered solution II”). i Ultrasonication of the solution. j Filtration of the solution with a 100 nm mesh. Sub-micro/microscale materials (“Sub-micro/microscale materials III”) were separated from the solution (“Filtered solution III”).
